97級-游婷敬-基於動態群播金鑰管理系統之改良研究

97級-游婷敬-基於動態群播金鑰管理系統之改良研究

[ 摘要 ]
隨著市場的需求，群播通訊技術的應用，如視訊會議和隨選視訊(Video On Demand, VOD)等，而不同的群播通訊技術，有著不同的運作方式，因此群播金鑰管理系統會隨著不同的環境而改變其需求條件。在前人的動態群播金鑰管理系統，主要針對動態的環境下，當成員加入或離開時，管理者能夠有效率的更新金鑰，並且不影響其他成員金鑰，而管理者更新金鑰的計算量為O(1)，但管理者在群播訊息時，卻因中國餘數定理(Chinese Remainder Theorem, CRT) 的群播技術，影響了重新發佈群播訊息時的計算量，並且造成相當大的負擔量。因此本研究將針對金鑰群播訊息重新傳送效率問題的不足，利用不同的群播技術或降低其金鑰的長度來改良，不但使動態群播管理系統保有原先管理者在成員更動時金鑰更新的優點，並降低重新計算其群播訊息時的計算負擔。

[ 英文摘要 ]
With the market demand, the applications of multicast communication technologies such as video conferencing and on-demand video (Video On Demand, VOD), etc. Different multicast communication technologies, there are different mode of operation, so multicast key management system as different environmental conditions and their needs change. In the previous dynamic multicast key management systems, they are mainly for dynamic environment. When members join or leave, managers can efficiently update the key and does not affect the key of the other members, and the calculation that key managers update keys is O (1). But in multicasting message, the multicast technology of the Chinese remainder theorem(CRT) impacts the computation loading of the re-calculate multicast message, Therefore the research will be to improve the lack of transmission efficiency of the multicast message, using of different multicast technology or reduce the length of its keys to improve not only the dynamic multicast management system managers to maintain the original members when the key changes update the advantages and reduce re-calculate the multicast message at the time of the computational loading.